x : 637 = 2345
x          = 2345 x 637
x          = 1493765

\(x:637=2345\\ x=2345-637\\ x=1708.\)

`212552 \div x =326`

`x= 212552 \div 326`

`x=652`

\(212552:x=326\)

\(\Rightarrow x=212522:326\)

\(\Rightarrow x\approx651,9\)

\(212552\div x=326\\ \Rightarrow x=212552\div326\\ \Rightarrow x=652\)

212 552 : x = 326
                x = 212552 : 326
                x = 652

\(212552:x=326\\ x=212552:326\\ x=652\)

652

x + ( x + 1 ) + ( x + 2 ) + .... + ( x + 2344 ) + 2345 = 2345

      ( có 2346 số hạng ) 

x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 2345 - 2345

x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 0

 ( có 2345 số hạng )

[ ( x + 2344 ) + x ] . 2345 : 2 = 0

[ ( x + 2344 ) + x ] . 2345 = 0 . 2

( 2x + 2344 ) . 2345 = 0

2x + 2344 = 0 : 2345

2x + 2344 = 0

2x = 0 - 2344

2x = - 2344

x = - 2344 : 2 = - 1172

Vậy x = - 1172 

Ta có :

250 * y + 750 * y = 1001 * 2345 - 2345

=> ( 250 + 750 ) * y = ( 1001 - 1 ) * 2345

=> 1000 * y = 1000 * 2345

=> y = 2345

Vậy y = 2345

\(yx\left(250+750\right)=2347345-2345\)

\(yx1000=2345000\)

\(y=2345000:1000\)

\(y=2345\)

y=2345

x^5-(x+1)x^4+(x+1)x^3-(x+1)x^2+(x+1)x-(x+1)

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